Write palettised targa.

Fixes ticket #1190.

Reviewed-by: Paul B Mahol

libavcodec/targaenc.c

@@ -78,7 +78,7 @@ static int targa_encode_normal(uint8_t *outbuf, const AVFrame *pic, int bpp, int
 static int targa_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                               const AVFrame *p, int *got_packet)
 {
-    int bpp, picsize, datasize = -1, ret;
+    int bpp, picsize, datasize = -1, ret, i;
     uint8_t *out;
 
     if(avctx->width > 0xffff || avctx->height > 0xffff) {
@@ -96,8 +96,20 @@ static int targa_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
     /* image descriptor byte: origin is always top-left, bits 0-3 specify alpha */
     pkt->data[17] = 0x20 | (avctx->pix_fmt == PIX_FMT_BGRA ? 8 : 0);
 
+    out = pkt->data + 18;  /* skip past the header we write */
+
     avctx->bits_per_coded_sample = av_get_bits_per_pixel(&av_pix_fmt_descriptors[avctx->pix_fmt]);
     switch(avctx->pix_fmt) {
+    case PIX_FMT_PAL8:
+        pkt->data[1]  = 1;          /* palette present */
+        pkt->data[2]  = TGA_PAL;    /* uncompressed palettised image */
+        pkt->data[6]  = 1;          /* palette contains 256 entries */
+        pkt->data[7]  = 24;         /* palette contains 24 bit entries */
+        pkt->data[16] = 8;          /* bpp */
+        for (i = 0; i < 256; i++)
+            AV_WL24(pkt->data + 18 + 3 * i, *(uint32_t *)(p->data[1] + i * 4));
+        out += 256 * 3;             /* skip past the palette we just output */
+        break;
     case PIX_FMT_GRAY8:
         pkt->data[2]  = TGA_BW;     /* uncompressed grayscale image */
         avctx->bits_per_coded_sample = 0x28;
@@ -123,8 +135,6 @@ static int targa_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
     }
     bpp = pkt->data[16] >> 3;
 
-    out = pkt->data + 18;  /* skip past the header we just output */
-
     /* try RLE compression */
     if (avctx->coder_type != FF_CODER_TYPE_RAW)
         datasize = targa_encode_rle(out, picsize, p, bpp, avctx->width, avctx->height);
@@ -170,7 +180,7 @@ AVCodec ff_targa_encoder = {
     .init           = targa_encode_init,
     .encode2        = targa_encode_frame,
     .pix_fmts       = (const enum PixelFormat[]){
-        PIX_FMT_BGR24, PIX_FMT_BGRA, PIX_FMT_RGB555LE, PIX_FMT_GRAY8,
+        PIX_FMT_BGR24, PIX_FMT_BGRA, PIX_FMT_RGB555LE, PIX_FMT_GRAY8, PIX_FMT_PAL8,
         PIX_FMT_NONE
     },
     .long_name= NULL_IF_CONFIG_SMALL("Truevision Targa image"),